Mega lo Mania
Alternative title: Released in the U.S. as TYRANTS - FIGHT THROUGH TIME for the Sega Genesis.
Platform: Amiga 500
Region: Europe
Media: Floppy
Controller: Mouse
Genre: Strategy - Top Down - Historical
Gametype: Licensed
Release Year: 1991
Developer: Sensible Software
Publisher: Image Works
Players: 1 Player
Licensed from: Chris Chapman (Chipper), Chris Yates (Cuddly Krix), Jon Hare (Jovial Jops), Tony Beckwith
Hardware: OCS, ECS
Conversions: Atari ST, Fujitsu FM Towns, Nintendo SNES, PC (DOS), Sega Mega Drive/Genesis, Sharp X68000
Disks: 2
Programmer: Chris Chapman (Chipper), Chris Yates (Cuddly Krix)
Musician: Anna Bentink, James O\'Donnell, John Green, Michael Burdett, Richard Joseph
Designer: Alan Tomkins, Jo Walker, Jon Hare (Jovial Jops)
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First you choose one out of four different characters to represent you, Scarlet (red army), Oberon (yellow army), Caesar (green army), or Madcap (blue army). The game is split into 10 levels - the first 9 are groups of 3 territories which can be completed in any other, while the final 'Mother of All Battles' has its own surprises. 

Land is mostly of sand, grass or ice. You start with 100 men and you can use whatever quantity you find necessary on each island. The rest men left will go to another level with another new 100. In the second half of the game you can freeze men to save them for the Mother of All Battles.
 
Once you select your island and place for your HQ, you must do some research for better weapons and defences. On the roof of your buildings you can put protectors like archers, gunmen, boiling oil men, and later on even laser turrets. If you send a team of unarmed men into an unoccupied square, they will build an additional base there, with larger armies completing this more quickly.

Later on higher levels, you'll also build mines and factories, as you'll need to dig a certain material for higher level weapons, depending on whether the area you're on is rich with a certain material or not. With each next level, you'll start from a higher technology level and be able to progress to one higher level up then the at previous level.

If there is more then just one enemy, you can make an alliance until you crush the other one - three of you can form an alliance against fourth enemy. For what its worth, a certain numeric level of defence is always stronger from the same level of attacker, and men that are not armed (conscripts) can only kill enemy soldiers, not destroy or attack enemy fort.

The main thing as it always is in strategy games is to be the sole survivor and lead your men to victory, experimenting on vicious technologies, equipping your men, making a perfect soldiers out of them, produce shields, weapons, planes... to dominate the world and crush your opponents. 

You can do the battling only in a certain quadrant, but don't be long as your men will automatically start building the fort, and it will be at the bottom of age level and you'll need to invent everything for that one again.
 
http://www.mobygames.com/game/amiga/mega-lo-mania
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CHEATS:

After you have selected the number of men you want to play the island,
click on the sector you wish to start in and then quickly go back to
the count of the number of men is.  Hold down the left mouse button to
reduce the number of men and you will find that when you start the
island you have the original number of men at your disposal and when
the level is complete you will have the increased number of men!

The following are cheat codes that give you lots of men per Epoch.

    MADCAP              SCARLET
1-"IVIAZXF1WMB"  1-"OVIAYASIWMO"  100 men
2-"ELEALUFOPNP"  2-"KMEAKXROPNQ"  200 men
3-"MOXALSLTFCZ"  3-"SPXAKVXTFCA"  300 men
4-"IFTAJNFPOVN"  4-"DGTAIQRPDVO"  400 men
5-"MCOALOIXVPR"  5-"SDOAGLLIVPS"  500 men
6-"NZHPVHLMLEN"  6-"SAIBUKXMLEO"  600 men
7-"QWCPHELHGLP"  7-"WXCBGHXHGLQ"  700 men
8-"MMYAFZEZXFD"  8-"SOYAECRZXFE"  800 men
9-"IQUBTYQSPAD"  9-"ORUBOBESPAE"  900 men

Level Codes:

2nd Epoch-"BNYABDUNBHV"  6th Epoch-"WWKDXGPXDBZ"
3rd Epoch-"COVCPMJVEBL"  7th Epoch-"KUUCTOPLGHV"
4th Epoch-"WKCCHIEUKNL"  8th Epoch-"PEHAJBPKZAQ"
5th Epoch-"GATAVRXRONT"  9th Epoch-"GYJDJHPNFHN"
Mother Battle-"TJLBVSNNIGD"

PLEASE NOTE:  You can't actually take part in the final battle
{The Mother Of Battles} unless you have suspended some of your men
from previous levels by freezing their towers.
